Resolve "Track position don't take care about disc number"

api/funkwhale_api/federation/serializers.py

api/funkwhale_api/music/metadata.py

api/funkwhale_api/music/migrations/0036_track_disc_number.py

api/funkwhale_api/music/models.py

api/funkwhale_api/music/serializers.py

api/funkwhale_api/music/tasks.py

api/funkwhale_api/music/views.py

api/tests/federation/test_serializers.py

api/tests/music/test_metadata.py

api/tests/music/test_models.py

api/tests/music/test_serializers.py

api/tests/music/test_tasks.py

changes/changelog.d/507.enhancement

dev.yml